MICROPHONES
Introduction
Use the Confidea PLM401F (40 cm) removable microphone (Mike) with the Wireless Units. This
microphone has a unidirectional response for optimum performance, even in noisy conditions, and has a
very low susceptibility to RF-interference from mobile phones.
Electrical and Acoustic Properties
Parameter Value
Transducer type Back electret (condenser)
Operating principle Pressure gradient
Polar pattern Uni-directional, cardioïd
Nominal impedance Bias resistor = 1k2
Vdd = 3.3 V DC,
SPL = 1Pa
Max.SPL at 1 kHz 110 DB SPL (1% THD+N)
Signal to noise ratio >67 dB(A)
Free field sensitivity 9.4 mV/Pa, ±3 dB @ 1 kHz or
(-40.5 dB, 0 dB = 1 V/Pa @ 1 kHz)
Power supply 3.3 V DC, 0.5 mA
Consumption 0.5 mA (without LED ring);
max. 25 mA (with illuminated ring)
MICROPHONES 35
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